6x²+xy-2y²+2x-8y-8 求:x的值 y的值
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6x²+xy-2y²+2x-8y-8 求:x的值 y的值
6x²+xy-2y²+2x-8y-8=0
(3x+2y)(2x-y)+2x-8y-8=0
(3x+2y+4)(2x-y-2)=0
3x+2y+4=0
2x-y-2=0
解得:x=0
y=-2
6x^2+xy-2y^2+2x-8y-8
=(2x-y)(3x+2y)+2(x-4y)-8
=(2x-y-2)(3x+2y+4)